How does Khp react with NaOH?
A commonly used primary standard for titration with sodium hydroxide solution is the weak acid potassium hydrogen phthalate or KHP (C8H5O4K). In this reaction as well, one mole of KHP completely reacts with one mole of NaOH. The titration of NaOH with KHP involves adding NaOH from the burette to a known volume of KHP.
How do you standardize NaOH with KHP?
To Standardize: Weigh ~0.8 g of dried KHP (MW = 204.23 g/mol) into an Erlenmeyer flask and dissolve in 50-75 mL of distilled water. Record the amount of KHP and water used. Add 4 drops of indicator into the flask and titrate to the first permanent appearance of pink.
What is the formula for KHP?
How do you calculate the molar amount of Khp used to neutralize the NaOH solution?
Calculate the molar amount of KHP used to neutralize the NaOH solution Number of moles of KHP = 0.5056 g/ 204.23 g/mol = 2.476 x 10 -3 moles 2.
What is Khp NaOH?
The reaction between an acid and base produces a salt and water, something that you may have heard before. In the reaction that you will be investigating, the acid is potassium hydrogen phthalate (KHP), and the base sodium hydroxide (NaOH). NaOH(aq) + KHC8H4O4(aq) = KNaC8H4O4(aq) + H2O(l)
Why do we standardize NaOH?
Solid NaOH is highly hygroscopic (it absorbs water from the air) and thus it cannot be accurately weighed. It also absorbs carbon dioxide from the air, forming sodium carbonate and thereby reducing the amount of sodium hydroxide present. This procedure is called standardizing the NaOH solution.
How do you standardize NaOH?
To standardize NaOH, start by pipetting 10.0 ml of 0.1 N hydrochloric acid (HC1) into a flask. Add approximately 50 ml of water (remember, not tap water) and three drops of methyl red indicator. Fill a 25 ml buret with the 0.1 N sodium hydroxide solution and record the initial volume.
What’s the molarity of NaOH?
1 Answer. Nam D. I get 4.62⋅10−2 M .
Why do we use Khp to standardize NaOH instead of HCl?
KHP is a good standard because it can be stored as a stable powder that does not absorb water from the air. So, we can measure out a known mass easily using a balance and calculate the number of moles from the mass.
Is Solid NaOH hygroscopic?
Solid sodium hydroxide is hygroscopic, which means that it absorbs moisture from the atmosphere. Once it has a little moisture it also absorbs carbon dioxide which is always present in air.
Is Khp an acid or base?
KHP is slightly acidic, and it is often used as a primary standard for acid-base titrations because it is solid and air-stable, making it easy to weigh accurately. It is not hygroscopic.
How do I calculate molar concentration?
Concentration formula: To find the molar concentration of a solution, simply divide the total moles of solute by the total volume of the solution in liters.
Is NaOH a base?
Sodium hydroxide is completely ionic, containing sodium ions and hydroxide ions. The hydroxide ion makes sodium hydroxide a strong base which reacts with acids to form water and the corresponding salts, e.g., with hydrochloric acid, sodium chloride is formed: NaOH( aq) + HCl(aq) → NaCl(aq) + H2O( l)
How do I calculate the concentration of a solution?
The molarity (M) of a solution is the number of moles of solute dissolved in one liter of solution. To calculate the molarity of a solution, you divide the moles of solute by the volume of the solution expressed in liters. Note that the volume is in liters of solution and not liters of solvent.